Necticut



(No Model.)

9 -E. THOMSON & A. L. ROHRER.

FIELD MAGNET FOR DYNAMOS.

No. 422,999. Patented Mar. 11,1890.v

IIVVENTOI? Elihu Thorns 017/ fllbe7*Z.. Rohrer ATTORNEY.

PETERS mn-umm mjwmimon, DV 0.

UNIT STATES PATENT OFFICE.

ELlI-IU THOMSON AND ALBERT L. ROHRER, OF LYNN, MASSACHUSETTS, AS- SIGNORS TO THE THOMSON-HOUSTON ELECTRIC COMPANY, OF CON- NECTICUT. I

FlELD-MAGN ET 'FOR DYNAMOS.

SPECIFICATION forming part of Letters Iatent No. 422,999, dated March 11, 1890. Application filed November 25,1889. Serial No. 33;,547. (NomodeL) To all whom it may concern.- plied and indicated in dotted lines. Fig. is

Be it known that we, ELIHUTHOMSON and a vertical section through the journal-bear- ALBERT L. ROHRER, citizens of the United ing of the machine, and shows a preferred States, and residents of Lynn, in the county form of oil-receptacle to be used with the ma- 5 of Essex and State of Massachusetts, have inchine. Fig. 6 illustrates the extension of the vented certain new and useful Field-Magnets invention to a machine having six poles.

for Dynamo-Electric Machines and Motors, of In Fig. 1, four sets of forged iron pieces or which the following is a specification. plates are indicated by the letter F, arranged Our invention relates to the construction of in position about the armature A of the ma- [0 a field-magnet for dynamo-electric machines chine. The adjoining ends of the plates of or motors. the several sets are preferably turned or bent The object of the invention is to secure a inward, so as to form together a magnet-pole, cheap, eflicient. and easily-assembled conto which coils C may be applied. Bythe arstruction, as well as to attain compactness for rangement shown afour-pole dynamo is made,

I 5 multipolar dynamos or motors intended for having four polar faces directed toward the use in confined situations, as on shipboard. armature.

A f nrther object of the invention is to se- K is the base-plate of the machine, to which cure all the ventilation possible in the fieldthe plates F may be secured by bolts or other magnet structure of dynamos or motors indevices. Each set may consist of any desired 20 tended for use in positions where very little number of plates F, arranged side by side, as ventilation ordinarily exists, as on shipboard. shown in Fig. 2, with air-spaces between Our invention consists in making the fieldthem. The plates are preferably kept sepamagnet from two or more sets of iron plates rated by the devices which are employed for or pieces arranged circumferentially around tying theni together at their adjoining pole 2 5 the armature, the plates or pieces of each set ends. 7 5 being separated from one another at free air- B B indicate binding plates or blocks by spaces, while the adjacent ends of the plates which the adjoining ends of the plates F of of different sets are united by tie blocks or different sets are connected together. These plates, at which point of connection the coils connecting pieces or blocks may be made of 0 are applied. either cast or wrought iron, as desired. The

Our invention consists, further, in the novel plates F, as well as the blocks or connectingconstruction shown and described, wherein plates B, are preferably secured together by the adjoining ends of the separated plates of means of bolts, which are inserted in opendifferent sets turn radially inward and are ings drilled at D, and which hold the struct- 3 5 there united by tie blocks or plates to form a ure firmly together, forming a compound fieldsolid magnet-core, over which electric coils magnet made up of the piecesF and B. After are wound. The separate plates making up the pieces F and B are bolted together the the compound-magnet structure are preferstructure is bored out for the reception of ably of forged iron. the armature A, as it is not practical to 40 In the accompanying drawings, Figure 1 is forge the pieces F F so accurately that when a side View of afour-pole dynamo machine or bolted in position they will present a true motor having a field-magnet structure organand uniform surface to the armature. ized in accordance with our invention. The As will be seen in Fig. 2, the plates F F are base of the machine is shown in partial secseparated by an air-gap, thus securing ven- 5 tion. Fig. 2 is an end view of the machine, tilation of the fields, which is necessary in 5 showing the separation of the iron plates. very large machines. The pieces F being Fig. 3 shows in side and edge View one of the made of wrought-iron, which has a high ca- .tie or binding blocks or plates. Fig. 4 shows pacity for the conveyance of magnetism, are in side and edge View one of the forged iron amply suflicient for the securing of a good 50 plates, with one of the tie blocks or plates apmagnetic circuit. \Vhere the field-poles are directly next the armature A the intermediate connecting-blooks of cast or wrought iron B B make the field-pole a solid structure, increasing the extent of iron surface presented to the armature and assisting thepassage of the magnetic lines across the air-field between the field-poles and armature, in which air-field by far the greater part of the total magnetic resistance is found.

By constructing the field-magnet of adynamo-electric machine after the manner of the invention, it is very easy to make any size machine desired, so far as the field structure is concerned, it being only necessary to employ a greater or less number of the pieces F F, secured together beside one another, as shown. The armature must of course be increased or diminished in length to correspond.

It is obvious that the invention is notlimited to any particular number of poles in the field-magnet structure, as a greater or even a less number might be used by varying the number of sets of plates F and properly changing the conformation of the plates of each set. Thus, as indicated in Fig. 6, a sixpole dynamo or motor might be constructed in the same manner, the only difference being that the ends of the plates F where they turn in for presentation to the armature would make a little greater angle with the connecting parts where the plates are separated from adjoining plates by the air-spaces.

In the drawings the commutator-brushes and the commutator are omitted, as they form no part of our invention.

In Fig. 5 there is shown a preferred arrangement for the removal and disposition of the oil after it has passed through the journalbox. S is the standard or pillar on which the shaft of the armature is borne, and J is the journal-box 011 the top of said standard. The standard or pillar S has a hole or oil-passage drilled through it lengthwise from the bottom upward, but not extending to the journal-box. Lateral ducts D D connect this passage, as

shown, to outer channels provided in the journal-box, and in the bed-plate K of the machine are formed oil-receptacles RR, Figs. 1 and 2, directly below the standard S, which prevent the escape of the oil after its use. The oil enters the journal-box at the top, as usual, spreads sidewise to the exterior of the box,where it is caught in the channels (shown) and led off to the ducts D D and to the oilreceptacleR.

\Vhat we claim as our invention is 1. In a dynamo'electric machine or motor, a field-magnet made up of two or more sets of separated iron plates having the adjoining ends of the plates of diiterent sets united by tie plates or blocks, and electric coils applied over the tie blocks and plates, as and for the purpose described.

2. In a dynamo-electric machine or motor, a multipolar field-magnet consisting of sets of forged iron plates separated from one another by air-spaces and having the adjoining ends turned inwardly for presentation as polepieces to the armature, in combination with tie plates or blocks connecting the adjoining ends, and electric coils applied over the said adjoining ends andconnecting-blocks.

3. In a dynamo-electric machine or motor, a multipolar field-magnet structure e0nsisting of sets of forged iron plates F, having their ends turned inwardly for presentation to the armature of the machine, in combination with connect-ing tie blocks or plates intel-posed between adjoining ends of the plates F, and coils C applied over such connected ends, as and for the purpose described.

Signed at Lynn, in the county of Essex and State of Massachusetts, this 20th day of November, A. D. 1889.

ELIHU THOMSON. ALBERT L. ROI-IRER.

\Vitnesses:

JOHN W. GIBBONEY, DUGALD McKiLLor. 

